Lifting-jack.



. I. HQMURDIGK & 0Q J. GARE Y.

LIFTING JACK. APPLICATION FILED 001231, 1911. J

UNITED PATENT OFFICE.

ISRAEL H. MURDICK AND CHARLES J. GAREY, F BENTON HARBOR, MICHIGAN.

LIFTING-JACK.

Specification of Letters Patent.

Patented J nly 2,1912.

Application filed October 31, 1911. Serial No. 657,790.

the provision of a lifting jack of this charactor in which a vehicle body or other heavy load may he raised with slight exertion on the part of the operator, and also that may be lowered when desired, without removing the jack from the load.

Another object of the invention is the.

provision of a lifting jack of this character in which a load may be raised to the desired elevation, and that will possess the requisite strength to sustain the load when elevated.

A further object-,of the invention is the provision of a lifting jack which is simple in construction, thoroughly reliable and cl"- ficient in operation, and inexpensive in manufactnre.

With these and other objects in view, the invention consists in the construetitm, combination and arrangement of parts, as will be hereinafter more fully described, illustrated in the accompanying drawings, and pointed out in the claims hereunto appended.

In the drawings: Figure 1 isaside eleva tion of a lifting jack constructed in accordance with the invention, the same being partly broken away. i Fig. 2 is a sectional view on the line 92 of Fig. 1. Fig. 3 is a vertical longitudinal sectional view. Fig. 4t is a top plan view. Fig. 5 is a plan view of the removable base plate.

Similar reference characters indicate corresponding parts throughout the several views of the drawings.

Referring to the drawings by numerals, the lifting jack comprises a vertical rectangular shaped frame 5 having in the vertical side bars 6 and 7 a slot. 8 and groove l), respectivcly,the latter being formed with rack teeth 10, while movable in the slot 8 is a. lifting bar 11, the lowenend of which is fornicdwith laterally projecting rec-tangular shaped guide lugs 12 engaging in guide slots 13 formed in the bars 6, and intersecting the slot 8, the lifting bar 11 in its outer edge being provided with teeth 14, while its inner rdgc is l'ormed with ratchet teeth 15 meshing with a rotatable cog wheel 16, the san also mcshingwiththe teeth ill, so that on its rotation the lift.

ing bar will either be raised or lowered in the frame.

The lower end ol the lrame .3 is provided with headed rcctangular-shaped studs 17 adapted for locking engagement. in kcvhole shaped slots lS i'ormcd in the top of a removable base 19 which is designed to vcrtic-ally support the frame when positioned upon a foundation.

llormcd on the outer edge of the side bar (5, near the upper end of the frame 5, are spaced parallel bearings '30, between which .is positioned a locking dog or pawl 21, supported upon a pivot 92 mounted in,

the bearings 20, the pawl or dog being designed to engage the teeth for locking the lifting bar it in raised position and against. retracting movement, the pawl or dog being readily and easily released in a manner i presently described.

Pi'oJct-llng laterally centrally l'roni the opposite sides ol' the cog wheel 113 are truncated stud journals which are rc-.

ccived in alining notches .25 in the ends of the limbs 26 of a l ork 27; on one end M an operating handle 28, the limbs being provided with inverted V-shaped.notclics. 2.) in the lower edgts lhcreol', the notches 21! forming seals receiving the fulcrum projections 30 extending laterally from the lower ends of swinging l'ulcrum arms 31 conneclcd t0 the side bars 7 ol' the frame 5 at the upper end thereof. may he adjustably engaged with the cog wheel. so that the leverage ol" the handle may be increased or decreased, as well as the tlirowjhereof'.

ltcmovably mounted upon the upper end of the lifting bar It is a hearing cap. 32, against which rests the load, when it is desired to raise the same. pawl or dog 21 is the crank end 33 ot a spring arm 34-, which, when swung in one direct-ion, releases the pawl or dog 21 from engagement with the tc'cth i l, and on swinging it in the reverse direction, the pawl or dog is engaged in the teeth 14. Now, for locking the pawl or dog against movement, when engaged with or disengaged from the teeth of the lifting bar, the arm 34 is engaged in notches 35 on either side of a re-. taining block 30 mounted at one side of the it will be seen that the fork Ilngaged with the laterally therefrom, at the upper end, of the slot in the other side bar and having rack engageable with the frame, rack teeth frame, the crank end of said arm 34- being pivoted in a bearing 37 fixed to or integral with ,the frame at the upper end thereofand projecting outwardly from the side bar (3 of the same.

Formed on the side bar 8 and projecting frame 5, are stop lugs which form abutments for the fork of the operating handle, when the latter has been brolilght to lowered position, and the lifting bar raised to its fullest extent.

Front the foregoing, taken in connection with the accompanying drawings, it is thought that the constructionand operatiml of the invention will be readily nnderstootjl, without requiring a more extended explanation. I

hat is claimed is:

1. A. lifting jack, comprising a vertical frame having a base, and also side bars provided with a slot and groove, respectively, rack teeth for ned in the. groove in one side bar, a lifting bar slidably mounted in the teeth, a rotatable cog wheel meshing with the rack teeth in the groove and on the lifting bar respectively, means for lockingengagementwith the lifting bar to hold the same at varying elevations, and an operating lever for the cog wheel.

2. A lifting jack, comprising a vertical frame having side bars, provided with a slot and groove, respectively, a removable base crumed arms and engaged with the cog wheel, and a removable cap carried on the free end of the lifting bar. 1

3. A lifting jack, comprising a vertical frame having side bars, provided with a slot. and groove, respectively, a, removable base engageahle with the frame, rack teeth formed in the groove in one side bar, a lifting bar slidably mounted in the slot and having rack teeth on the inner and outer edges thereof, a rotatable cog wheel meshing with the rack teeth in the groove and on the inneredges of the lifting bar, respectively, means for locking engagement with the teeth on the lifting bar at the outer edge thereof to hold the same'at varying elevations, fulerumed arms pivoted to the frame, an operating lever supported by the ful crumed arms and engaged with the cog wheel, a remm'able cap carried on the free end of the lifting bar, and means acting upon the locking means for bringing into and out of. engagement with the teeth on the outer edge of'the lifting bar.

4t. Alifting jack, comprising a vertical frame having side bars, provided with a slot and groove, respectively, a removable base cngageable with the frame, rack teeth formed in the groove in one side bar, a lift- 111g bar shdably mounted in the slot and raving rack teeth on the inner and outer edges thereof, rotatable cog wheel meshing with therack teeth in. the groove and on the inner edges of the lifting bar, respectively, means for locking engagement with the teeth on the lifting bar at the outer edge thereof to hold the same at var ving,eleva-- tions, fulcrluned arms pivoted to the frai'ne, an operating lever supported by the fol crnmed arms and engaged with the cog wheel, a removable cap carried on the free end of the lifting bar, and means for guiding the lifting bar in its sliding movement in the, slot. v i

In testimony whereof we aflix our signatures in presence of two witnesses.

ISRAEL H. l\[llRl')lCl(. CHA hLES J. GAR E \Vitnesses: q

Hassm. E. J o1 insoN, C. R. BARNARD. 

